Pluteus Definition
 plo͝otēəs 
  pluteus
  
    noun
  
 The free-swimming, ciliated, larval stage of sea urchins and brittle stars, characterized by elongated, slender arms.
 Webster's New World 
(zoology) The free-swimming larvae of echinoderms.
Wiktionary 
Synonyms: 
  
- roof mushroom
- genus Pluteus
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